243055331 has 16 divisors (see below), whose sum is σ = 253667328. Its totient is φ = 232696800.

The previous prime is 243055327. The next prime is 243055349. The reversal of 243055331 is 133550342.

It is a cyclic number.

It is not a de Polignac number, because 243055331 - 2² = 243055327 is a prime.

It is a super-2 number, since 2×243055331² = 118151787855039122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243055331.

It is not an unprimeable number, because it can be changed into a prime (243055301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1151816 + ... + 1152026.

It is an arithmetic number, because the mean of its divisors is an integer number (15854208).

Almost surely, 2^243055331 is an apocalyptic number.

243055331 is a deficient number, since it is larger than the sum of its proper divisors (10611997).

243055331 is a wasteful number, since it uses less digits than its factorization.

243055331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 243055331 is about 15590.2319097568. The cubic root of 243055331 is about 624.0725067442.

The spelling of 243055331 in words is "two hundred forty-three million, fifty-five thousand, three hundred thirty-one".